Parameters Of The Channels - Siemens SIMATIC ET 200SP HA Equipment Manual

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Table Of Contents

Table of Contents

Function:

You can specify the discrepancy time for each channel pair.

Behavior while discrepancy time is running:

While the configured discrepancy time is running inside the module, the affected input channels

supply either the last valid value or "0" to the safety program in the F-CPU, depending on the

configured discrepancy behavior.

Behavior after expiration of the discrepancy time:

If after expiration of the configured discrepancy time the input signals are still different (when

testing for non-equivalence: input signals are still the same), e.g. due to a sensor wire break, a

discrepancy error is detected and the diagnostics message "Discrepancy error" is generated

along with information on the faulty channels.

Reintegration after discrepancy error

Requirement:

You have configured the following:

• "Sensor evaluation": "1oo2 evaluation, equivalent" or "1oo2 evaluation, non-equivalent"

Function:

You use this parameter to specify when a discrepancy error is regarded as corrected, thus

enabling reintegration of the affected input channels. You have the following parameter

assignment options:

• "Test 0-Signal necessary"

• "Test 0-Signal not necessary"

Option "Test 0-Signal necessary":

If you have configured "Test 0-Signal necessary", a discrepancy error is not regarded as corrected

until a 0-signal is present again at both of the affected input channels.

If you are using non-equivalent sensors, i.e. "Sensor evaluation" is set to "1oo2 evaluation, non-

equivalent", the result of the channel pair must be "0" again.

Option "Test 0-Signal not necessary":

If you have configured "Test 0-Signal not necessary", a discrepancy error is regarded as corrected

when a discrepancy is no longer present at both of the affected input channels.

5.2.5